1.Major thermostats : ego (german brand) 2.Backup thermostats : wako (japanese brand) 3.Hot water tank insulation foam, ul approved 4.Automatic re-fill water system 5.Water level and lighting design Model no.:bd-20g Type:boiled hot water Tank capacity:hot: 20 gallon Watt:hot: 6000w Water connection:tap water Power:220v Dimension:47.5x54.5x145cm Option:s.S. Stand Safety design: 1. Double protection with 2 thermostats 2. Panasonic elcb safety equipment 3. Safety faucet body : anti-scalded material 4. Safety faucet design: avoid child scalded by hot water 5. Cj-20g/30g is required independent power supply with 5.5mm width wire -